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Summary Of Significant Accounting Policies (Narrative) (Details). - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items] |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ 200 | $ (400) | $ (500)
Cash | 13,500 | 19,200 |
Cash and cash equivalents | 9,660 | 19,232 |
Goodwill | 35,717 | 70,608 | 70,608
Goodwill impairment | $ 34,891 | $ 0 | $ 0
Incremental shares excluded from the calculation of incremental shares attributable to stock options and restricted stock | 2,925,091 | 2,760,983 | 1,582,222
Business Exit Costs | $ 1,300 |  |
Impairment of Richmond, Virginia Technical Center assets | 3,500 |  |
Restructuring and Related Cost, Accelerated Depreciation | 300 |  |
Gain (Loss) on Termination of Lease | 100 |  |
Restructuring Reserve | 513 | $ 0 |
Charges | 4,977 |  |
Payments for Restructuring | 822 |  |
Restructuring Reserve, Charges Against Assets | 3,642 |  |
Aluminum Extrusions |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Goodwill | 13,270 | 13,270 | $ 13,270
Goodwill impairment | 0 |  |
Closure of PE Films Technical Center |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restructuring Reserve |  | 4,977 |
Employee Severance [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restructuring Reserve | 385 | 0 |
Charges | 895 |  |
Payments for Restructuring | 510 |  |
Restructuring Reserve, Charges Against Assets | 0 |  |
Employee Severance [Member] | Closure of PE Films Technical Center |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restructuring Reserve |  | 895 |
Asset Impairment |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restructuring Reserve | 0 | 0 |
Charges | 3,454 |  |
Payments for Restructuring | 0 |  |
Restructuring Reserve, Charges Against Assets | 3,454 |  |
Asset Impairment | Closure of PE Films Technical Center |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restructuring Reserve |  | 3,454 |
Other Restructuring [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restructuring Reserve | 128 | 0 |
Charges | 628 |  |
Payments for Restructuring | 312 |  |
Restructuring Reserve, Charges Against Assets | 188 |  |
Other Restructuring [Member] | Closure of PE Films Technical Center |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restructuring Reserve |  | 628 |
Employee Severance [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Business Exit Costs | 900 |  |
Other Expense |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Business Exit Costs | 400 |  |
Surface protection films |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Goodwill impairment | 34,900 |  |
Goodwill, Impairment Loss, Net of Tax | 27,000 |  |
Surface protection films |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Goodwill | $ 22,400 |  |
Minimum | Buildings And Land Improvements |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Average useful life | 5 years |  |
Minimum | Machinery and Equipment |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Average useful life | 2 years |  |
Maximum | Buildings And Land Improvements |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Average useful life | 40 years |  |
Maximum | Machinery and Equipment |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Average useful life | 20 years |  |
Foreign Country |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cash and cash equivalents | $ 9,800 | $ 10,300 |

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